Spine
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Systematic review. ⋯ Low. StrENGTH OF RECOMMENDATION: Weak.
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Prospective study. ⋯ 3.
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Retrospective case series. ⋯ 4.
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Retrospective analysis of a prospectively collected database. ⋯ N/A
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Perioperative complications and mortality after spinal fusions: analysis of trends and risk factors.
Retrospective review. ⋯ N/A.